关于sources
要使用好apt-get就要配置好一个名为sources.list的资源列表，资源列表指向Debian系统的软件库，apt-get会从该软件库安装各种软件包。sources.list文件位于/etc/apt目录下，下面是Sarge、Etch和Sid三个版本的写法，你可任选一种，最好不要多版本混用：
#sources.list for Sarge(stable):
deb http://http.us.debian.org/debian stable main contrib non-free
deb http://non-us.debian.org/debian-non-US stable/non-US main contrib non-free
deb http://security.debian.org stable/updates main contrib non-free
#Uncomment if you want the apt-get source function to work
#deb-src http://http.us.debian.org/debian stable main contrib non-free
#deb-src http://non-us.debian.org/debian-non-US stable/non-US main contrib non-free
#sources.list for Etch(testing):
deb http://http.us.debian.org/debian testing main contrib non-free
deb http://non-us.debian.org/debian-non-US testing/non-US main contrib non-free
deb http://security.debian.org testing/updates main contrib non-free
#Uncomment if you want the apt-get source function to work
#deb-src http://http.us.debian.org/debian testing main contrib non-free
#deb-src http://non-us.debian.org/debian-non-US testing/non-US main contrib non-free
#sources.list for Sid(unstable):
deb ftp://ftp.us.debian.org/debian unstable main contrib non-free
deb ftp://non-us.debian.org/debian-non-US unstable/non-US main contrib non-free
#Uncomment if you want the apt-get source function to work
#deb-src http://http.us.debian.org/debian unstable main contrib non-free
#deb-src http://non-us.debian.org/debian-non-US unstable/non-US main contrib non-free
sources.list文件的内容决定了Debian的版本。安全更新只存在于stable和testing版中，unstable没有安全更新。进入stable的软件都经过严格的依赖测试和安全测试，所以如果你想系统稳定，用于工作，最好使用stable，如果你想使用最新版的软件，就使用testing或unstable。Woody、Sarge和Sid是Debian 3.x三个版本中的代号，我们一般都是以代号来称呼debian不同版本。所有Debian发行版的代号全都取自电影Toy Story，Woody是那个牛仔，Sarge是绿色塑胶军队的领导，Sid是破坏玩具的小孩。
